Bring in Grant Morrison and have him write the script. Imagine how sick that would be.
Remove all Synder's involvement, and I mean all. If you even smell Synder near anything related to the film, scrap it and start over.
Bring in a director that understands the character to a tee. If it help, bring in Brice Timm as a consultant on the film.
Fix the editing and stupid Jesus refences that happened every 5 seconds in MOS and BvS.
Most of all, WB's big wigs needs to the let the director and he's crew do there jobs and stop interfering.